Island



(No Model.)

H.. TALLMAN. MOLD FUR INGUTS- No. 412,566. Patented Oct. 8, 1889.

WITNESSES. INVENTEJR.

N. PETERS. Phdlo-Lllhnlnphsr, Wilhiullnn. D C.

UNITED STATES "PATENT OFFICE.

HENRY G. TALLMAN, OF CRANSTON, ASSIGN OR TO CHARLES F. IRONS, OF

PROVIDENCE, RHODE ISLAND.

MOLD FOR INGOTS.

SPECIFICATION forming part of Letters Patent No. 412,566, dated October8, 1889.

Application filed May 31, 1889. Serial No. 312,798. (No model.)

To all whom it may concern..-

Be it known that I, HENRY O. TALLMAN, of the town of Granstom'in thecounty of Providence, in the State of Rhode Island, have invented acertain new and useful Improvement in 'Ingot-Molds; and I declare thefollowing to be a specification thereof, reference being had to theaccompanying drawings.

Like letters indicate like parts.

Figure 1 is a side elevation of my invention, with the mold shownpartially in section on the line a; cc of Fig. 2. Fig. 2 is a top planof said invention.

My invention relates to the metallic molds used in casting ingots, moreespecially of gold; and it consists of a solid mold having a central andtapering matrix, an indentation at its top on one side for the crucibleto rest in, and a hub integral with said mold, in which hub a handle maybe secured, as hereinafter specified.

In the drawings, A represents a solid mold made, preferably, ofcast-iron, having a central and slightly-tapering matrix a. On the fronttop edge thereof is an indentation or recess 17, and on the oppositeside is a hub a, cast integral with said mold; The hub a may becentrally bored and'screw-tl1readed, as indicated in dotted lines inFig. 1, and a handle B, having a screw-threaded end, may be inserted insaid hub, as shown. The check-nut (1 serves to prevent the handle fromturning out of position.

Molds for casting gold and other ingots have hitherto been made asfollows: Two pieces of steel, each having a central longitudinal channelplaned therein. A series of holes is bored through these pieces on eachside of the channel. The two pieces are then placed with their channeledfaces together, and a series of rivets is passed through said holes fromside to side, and they are headed by hammering in the usual manner. Aplug is driven into the channel or opening thus formed and closes oneend of the mold. The handle has usually been attached to the mold by ametallic loop, which, extending from the handle, passes around the moldon the outside and is secured thereto by a set=screw or otherwise.

Great inconvenience and much difficulty have been experienced in the useof ingotmolds thus constructed. The repeated heat ing of a mold so madecauses the gradual expansion and consequent lengthening of the rivets bywhich the two pieces are held together, so that these two halves orpieces of the mold are not kept in perfect contact, but are slightlyseparated. The melted gold, when poured into the matrix, flows into thecracks or openings thus formed. When the gold cools and solidifies, theingot cannot be easily taken out, because it is held by the slight ribson two of its opposite sides, which have been thus formed within thecracks or openings between the two parts of the mold.

Besides this, the grooves or tool-marks left all along the surface ofthe matrix by the planing operation above mentioned when the channelsare made still further tend to hold the ingot frictionally in the moldand prevent its easy removal. It is often, therefore, necessary in theuse of a mold of this description to dislodge the ingot by turning themold upside down and striking heavy blows with it, or sometimes toremove the plug at the bottom of the matrix and force the ingot out bypoundinga rod or bar against the inner end of the ingot.

It is the purpose of my invention to avoid these difficulties. As myimproved mold is made in one piece cast solid on all sides, with acentral matrix formed by casting around a core instead of by rivetingtogether channeled pieces, there are no partsto separate and no harmfulexpansion or contraction is possible.

In casting my mold I use a smooth steel core, so that the surfaces ofthe matrix are left smooth and are Wholly free from grooves, tool-marks,projections, or roughness of any kind. The result is that when themelted gold has cooled in the mold and has become solidified the ingotdrops easily out of the mold without any hinderance when the mold isinverted, and repeated use does notimpair the usefulness of the mold inthis respect. The indentation or notch b is useful to receive the corneror edge of the crucible and to prevent the sidewise displacement of thelatter while the molten metal is poured theremuch cheaper in cost asWell as more durable and more easily used.

I claim as a useful and novel invention and desire to secure by LettersPatent 1. The combination of the mold A, having the matrix a, the hub c,the handle B, screwed into said hub, and the check-nut d, substantiallyas specified.

2. The improved ingot-mold A herein described, having the matrix a, thecruciblenotch 27, the hub c, the handle B, screwed into said hub, andthe check-nut d, substantially as shown.

HENRY G. TALLMAN. Witnesses:

DANIEL W. FINK, WARREN R. PERCE.

